Kindly help me to run following program in moodle.

# first i made file in shell prompt 
cat  > fun
def add()
^d

then i write shell script
fun_check.sh

cat fun |  grep "def" fun  > file1

#grep "def" fun > file1
cat file1
cat file1 | head -n1 | cut -d " " -f1 >file2
cat file2

# content=$(cat file2)
#--- remove multiple spaces ---
     cat file2 | sed 's/  */ /g' > dummy
content=$(cat dummy)
echo "content" $content
s="def"

if [ "$s" == "$content" ]
then
   echo "with function"
else
echo "without function"
fi

This program perfectly run in shell prompt
but when i try to execute this program in moodle it is not working.

Actually i want that my shell script program  check function available in python program or not.
and i want that student get  grade automatic  if student  write program by  function.

When i write above program in evaluate.sh file then it shows command not found error cat, grep so on.

kindly help me to execute above program in moodle.